Thanks, Amber.
Overread ... I too usually use Aperture, but these two happened to be the opposite. The gulls were at dusk and I didn't have my pod with me, so didn't want to risk total blur with Aperture (and didn't want my ISO even higher).
Will add shot details in future.
As for the second shot -- intentional silhouette -- didn't want bird details. Actually got more than I wanted and meant to darken the bird up a bit more.
Thanks for comments to you both.